Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eb126c3f3b85525…

MALICIOUS

PDF

60.3 KB Created: 2020-11-16 21:46:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 346c949401713a0fd1da56abf19acdba SHA-1: 96dd4b1a5c4ce412ac6ccea71d06bfaf13b6a1c4 SHA-256: 4eb126c3f3b85525b9221c218bb5d52dd3c12cd4dcc64bdf533f01f8d2dadc55
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/strik?utm_term=mon+ket+stream'. This URL is the primary indicator of malicious intent, likely serving as a lure for phishing or to download further malicious content. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cctraff.ru/strik?utm_term=mon+ket+stream
    • https://cdn-cms.f-static.net/uploads/4408355/normal_5faf46862ad21.pdf
    • https://cdn-cms.f-static.net/uploads/4401983/normal_5f90b3a01dc60.pdf
    • https://cdn-cms.f-static.net/uploads/4413004/normal_5fa0fa51b3e6f.pdf
    • https://cdn-cms.f-static.net/uploads/4372696/normal_5f9d164bd1aac.pdf
    • https://cdn-cms.f-static.net/uploads/4459464/normal_5fa776e916a28.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/buponuwebi/anemia_de_celulas_falciformes_diagnostico_diferencial.pdf
    • https://s3.amazonaws.com/gopuze/convertir_de_a_word_online_gratis.pdf
    • https://s3.amazonaws.com/tarajix/sufusalaz.pdf
    • https://uploads.strikinglycdn.com/files/3adc7082-d90b-4769-af73-31e6b5636542/tonibadexute.pdf
    • https://s3.amazonaws.com/takateg/dukisib.pdf
    • https://s3.amazonaws.com/zetare/72147682111.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b048.bin
e8c31f5e819fd2d989ea2aeec542b20fffb5ba0b371098624de939c53bfa47a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB048 4868 bytes
font_01_sfnt_off0000c0c7.bin
104156427fd1dd19a644da0a6856005b3389c22b9135fe42dc0a745dbcfe08ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C7 10296 bytes

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